CA2150958C

CA2150958C - Process and device for producing a package of elongated winding material

Info

Publication number: CA2150958C
Application number: CA002150958A
Authority: CA
Inventors: Werner Eck; Hans-Georg Horndler
Original assignee: Maschinenfabrik Niehoff GmbH and Co KG
Current assignee: Maschinenfabrik Niehoff GmbH and Co KG
Priority date: 1992-12-04
Filing date: 1992-12-04
Publication date: 2005-11-22
Anticipated expiration: 2012-12-04
Also published as: EP0672016B2; WO1994013570A1; ES2107555T5; ATE178024T1; EP0672016B1; EP0628013B1; ES2107555T3; BR9207179A; EP0628013A1; FI952702A; WO1994013569A1; FI952702A0; DE59309477D1; JPH08504725A; CN1091718A; CN1066123C; EP0672016A1; US5593108A; DE59208786D1; ATE156456T1

Abstract

A process and device are disclosed for producing a package of elongated winding material. A winding bobbin (50) has a conical winding core (52) and a first detachable flange (53) arranged at the side of the winding core (52) having the smaller diameter, and a second flange (54) arranged at the other side of the winding core (52). The winding bobbin (50) is held in a winding device by means of bobbin holding members (103, 104) which center both flanges (53, 54) and are supported on their surface opposite to the winding core (52). The elongated winding material (D) is then wound on the bobbin (50), the winding process being controlled in such a way that a predetermined type of bobbin is obtained. In particular when a plastic bobbin (50) is used, the package is easy to transport but is at the same time very resistant, so that additional packaging measures may be dispensed with. Packaging waste may thus be almost entirely avoided.

Description

02!08 ' 95 10 : J-1 $+49 89 539040 ~ OU_' Wd 9413569 ~IL~~ ~''~ TB-1~~ '~~,Q,'-nlC~( J PGT~EP92~02804 T T(IArJSi_~,-l~it7N

process and device for producing a package of elongated wixiding material The present invention relates to a process and a device for producing a package or elongated winda.ng material. Here elongated winding material is preferably to be understood as winding matexial containing metal, in particular copper, such as wire, blank or plastic-coated strands and so on. However, the invention shall also be applicable to winding material. such as glass fibre cables, windable in a similar gray as the exa~~pl.es mentioned. For simplicity reasons such elongated winding material is referred to as wire ire the following paragraphs.
wire, in particular copper wire; is normally transported as a package, consisting of a metal bobbin and the wire vround on it.
The metal bobbin is designed rotationally s~mmetr.ical and includes a cylindrical or conical wending core, r~r,e flange being arranged at either end. TY~e winding devices compriCe correspondingly conical bobbin holding meribers, engaging -nto the conical recesses of the bobk~~.n, at the same time haldirg ar_d centering them during the winding process. The winding itself is performed either by rotating the bolabi_n, or by putting the wire onto the stationary bobb=:~ by means of a flyer device, revolving round the bobbin. In case o~ a rotating bobbin the wire is wound up twist-free: in case a flyer device is used, a turning of the wire, a so-called twist of 360° per winding, results.
Metal bobbins offer the advantage of high resistance and lorxg life time. However, this is opposed by the disadvantage of a relatively high weight portion of the metal. bobbin in the finished package and the metal, bobbins rave to be transported from the user bac7t to the manufacturer, causing considerable additional Lranspcrt costs.
These skilled in the art therefore tied to find a prac2ss for producing packages dcing without a bobbin. such a process is described in EP~-B-0 334 2~.1_ Ir_ .the process described there a winding tool consisting of metal is used, designed as a cozwentional :petal bobbin, however the winding core being designed cor~icall.y and the flange at tre end of the winding core with the smaller diameter being detachable. A thin pasteboard tube is put onto thin winding core and the wire is then wound on in layers of increasing number of turns, these numbers of turns being chosen such that it results in layers inclined towards the conical winding core.
Zhis is called a d~ouble-cPnical winding design or an opposed conical windil~g. After the winding process the lower flange of the winding tool is loosened and the winding tool is removed ~z~om the bobbin, after the bobbin-less package has been hooped and coated with plastic foil.
This package offers the advantage of a favourable transport volume and weight and a good strength with optimum wind-off conditions of the wire at the user. The packaging materials used need not be transported back to the wire manufacturer, thus no transport costs incur. 'Therefore this packaging of winding material has become generally accepted by many wire users.
However, this bobbin-free packaging has one disadvantage, being of less importance for small and medium-sire users, however of major importance for large users, such as the automotive industry. The automotive industry needs large amounts of copper stxands coated with insulating material, today in many cages manufactured and supplied sn form of such bobbin-free packages.
In accordance with today's manufacturing philosophy, the packages are supplisd directly from the cable manufacaurer to the consumer, cxeating a constiderable amount of packaging waste, i.e. pasteboard tubes, fastening straps and plastic coatings which have to~b~ collected and disposed.
zr. addition the hand~.ing of the bobbin-free packages presupposes a certain care during transport, as the pasteboard used is sensitive to humidity and the pa.ckag2 may easily be damaged when stacked roughly.
Therefore it is the tas:z of the present invention to create a process and a device for producizzg a package, having favourable transport propertie8 on the one hand, however, doing with a small amount of packaging material on the other hand.

2a The invention provides a process for manufacturing a package with elongated winding material which can be transported without packaging, including the following procedure steps in chronological sequence: composing a winding bobbin having a conical winding core and a first and a second flange at each end thereof, at least the first flange at the smaller diameter end of the winding core being detachably connected to the winding core; securing the first flange to the winding core in such manner that it does not inadvertently loosen from the winding core during winding and transport, inserting the winding bobbin into a winding device, wherein said winding bobbin is received by two bobbin holding members, centering the two flanges and supporting them against winding pressure in the winding device; winding the winding material on the winding bobbin by means of a traversing unit that is controlled by a control unit, such that a predetermined winding type is formed on the bobbin; terminating winding and removing the winding bobbin from the winding device when the bobbin is as full as desired, and severing the winding material to create a cut end and fixing the cut end of the winding material to the winding bobbin.
The invE=ntion also provides a device for carrying out the aforesaid process wherein said two bobbin holding members receive the ends of the bobbin and center them, the bobbin holding members being arranged such that the longitudinal axis of the winding bobbin received therein is basically vertica7_; the traversing unit supplying the elongated winding material to the bobbin being movable parallel to the bobbin's longitudinal axis; the drive unit being connected to one bobbin holding member or to the traversing unit in such a way that either the bobbin or the traversing unit rc>tate around the bobbin's longitudinal 2b axis; further comprising: a lifting equipment for moving at least one of the bobbin holding members with regard to the bobbin, such that the winding bobbin can be put in or removed from the winding device; and the control unit controlling rotational motion of the drive unit and the motion of the traversing unit parallel to the bobbin axis in such a way that t:he predetermined winding type is formed on the bobbin; characterized in that the bobbin holding members are designed to receive the winding bobbin; a first, lower bobbin holding member (103) including a supporting plate (108, 109), supporting directly a first, lower flange (53) of the winding bobbin; a cone (111) arranged on said supporting plate, engaging into a bore (72) of said lower flange (53) for centering the winding bobbin; a second, upper bobbin holding member (104) including a basically circular plate (120), designed to support a second upper flange of the winding bobbin; said basically circular plate (120) including a first centering unit (112) protruding towards the winding bobbin and adjacent to an inner wall of the winding core.
The invention also provides a winding bobbin for use in the above process and/or in the above device, the winding bobbin being designed for holding elongated winding material and in particular winding material containing metal, such as wire, strands and plastic-coated strands, with a basically rotationally symmetrical, conical hollow winding core, having a first end with smaller diameter and a second end with larger diameter, a hollow space (2e) of the conical winding core (2) being designed conically and the 3 0 coning angle ( 18 ) of an outer j acket ( 2 c ) and the coning angle (19) of an inner jacket (2d) being basically identical, the hollow space (2e) opposing the second end with larger diameter being open, the second flange, arranged 2c at the second end of the winding core having a larger diameter, characterized in that the winding bobbin includes the first and the second flange, this first flange (3) being detachably fastened to the first end of the winding core (2a) with smaller diameter (2a) and connecting means (9, 10, 23) are being provided, connecting this first flange (3) and the winding core (2) with each other, being designed such that the first fl,~nge cannot loosen from the winding core during winding and transport, these connecting means include snap-in juts (64) at a certain distance to each other, protruding radial:ly to the inside, interacting with adequately design.=_d, radially extending holding juts (79) at the first flange (53), when assembled, such that the first flange and the winding core are held relatively to each other in axial direction, i.e. in longitudinal direction, of the axis of rotation (56) of the winding bobbin (50), and at least one locking element (86) is provided, securing the connection between the first flange and the winding core radially.

The process as provided for by this invent:.or~ makes it possible to proCude a package having favourable transpart properties, creating almost no packaging waste.
This i.s achieved by using a divisable winding bobbin, preferably made of plastic. As the winding bobbin is designed as a rlivisibla one, the winda.ng bobbin may be disassembled after winding off the aind.ing material. Thus the transport volume for transporting the empty bobbins from the Wire users ba.c:l. to the wire ma~-lufacturers is consldert~bly reduced.
The flanges of the winding bobbin will be supporter from outside during the winding process. This offers the advantage that the flanges da mot have to absorb axial winding pxesau.re during Lhe winding praCedure and thug they mal~ be nlanuFactur_.ed with less material and this results in less we~.ght. an the other hand chic results :gin the major advantage thaC th3_s design c:ox~sidr~rab3.y raduces the acrurrenee of elastic restoring forceo, in payticulax~ at the lower bobbin f3_ange. zn case a pl~ast~ic bobbin is c~'~ucked with conventional conical chucking devices, the flanges deform during winding to the outside as seerA from the winding core due to the axial winding pressure.
this results in a restoring force of the flanges, pressing on the finished winding, pass:.b~y res;zlting in winding-oif problems late.T on. However, if the flange deforming is prevented dsring w=ndirg, as proposed by the present invention, no elastic restoring force is created, them: is no loading on the package and a trooping of the package is sot necessary. Thus neither a pasteboard inbeyt nor hooping sna.terial is required or has to be disposed of.
For large users of copper wire and/or copper strands with insuia.tion, such as the automot:we industry, the paclcage provided for by the present invention results in major d;~vanta.ges .

_21~~9~8 02: 08 ' 95 10: 35 ~+49 89 5439040 C~ 005 WO 94/13569 PCT/EP92/OZg04 The plastic bobbin preferably used has a iota weight, however it is tx-u2 that the overall weight of the package is higher r_han the weight of a comparable bobbin-free package, but it is considerably lower than the overall weight of a package using a Conventional metal bobbin.
As the bobbins used may be divided, the bobbins may be divided immediately after emptying them and they may be stacked ir. a space-saving way. Therefore the automotive industry does not need additional storing room for the empty bobbins or other packaging containers (e. g, casks).
The empty bobbins may be transported back to the cable manufacturer as soon as a new delivery of fzlled plastic bcbbins arrives. Due to the low loading volume and the low transport weight, the loading of the empty bobbins and their transport is very easy.
In the procedure as provided for by this invention, the wiz~~.ing of the wire may be performed by rotatir_g the bobbin around i.ts longitudinal axis. This offers the advantage that the wire is put on without twist. However, it is also possible to use a stationary bobbin and to have the traversing unit as so-called flyer rotate around the bobbin.
In a preferred embod~.ment of the process as provided for by the in~~entior., a winding type is wound onto the bobbin, as is prior art i.n EP-H-0 334 217._ This means, the traversing unit is controlled by a control unit ire such a way that the laying starts ar. the winding core w:lth smaller diameter and that a first winding layer is laid, designed in such a way - with regard to the number arid pitch of turns - that the winding covers or:J.y a smaller axial area of the winding core anti does not extend to the end of the winding core with the larg°r diameter_ The winding layer is then wound back and a new winding layer with an increased number of turns is laid. The succeeding winding layers ars controlled in such a way that the winding layers in the field of the winding core with smaller diameter have the greatest distance from the rotation af~is of the bobbin. This means, the winding layers, as seen ir, a central longitudinal section of the bobbin, are inclined 02!08 '95 10:38 $+99 89 5439040 _ 21~a95~ ~00~
WO 94/13509 PCT/~P9~/U2804 S
towards the jacket of the winding core in an acute angle. This creates a double-conical winding design, resulting ir_ an optimum strength of the package.
r~s described in the above mentioned EP-~-0 334 211, the laying of the wiziding may be done with the same number Qf turns or with a decreasing number of turns as soon as the first winding layer reaches the flange on the side of the winding core slaving a larger diameter, such that finally a winding design is created, in which the outer winding layer3 are parallel to the longitudinal axis of the bobbin.
_. The device as provided for by this invention for perfcnning this process includes two bobbin holding mambers, holding the winding bobbin during the winding process. each bobbin holding member includes a centering device to center the bobbin, as well as a holding de~~ice, for supporting at least tr~e outer circumferential area of the relevarm flange of the bobbin.
Bas~.cally this holding device may be designed as supporting plate, supporting the flange surface. Instead of a surface support a point support is also possible, where a number of supporting surfaces of this supporting eauipment are in contact with the flange of a winding bobbin to be received.
The winding device is px-eferably controlled by a control unit, to be able to generate a certain winding type.
Furthermore the invention! provides a winding babbin, especially suited for the use with the pxacess as provided fQr by this invention.
The winding bobbin as provided for by this inwerztion is r!-made of plast~.c and has a conical winding core, whose wall thickness is constant in general, such that the coning angle of the outer and inner packet of the winding core is basically identical. At least the flange of the winding bobbin, arranged at the winding core with the smaller diameter, is detachably connected to it.
Due to this design ~.t is possible to insert the winding taxes separated fxom the detachable flange into each other. Thus the empty winding bobbin may tae transported by separating the winding core and flange and stacking the winding cores-and hobbit flanges in a space-saving way.

21~09~8 02/OB '95 10:38 $*49 89 5439010 -WO 9/13569 PC~'/EP92/fl28Q4 As will be shown later, this permits a considerable reduction in loading volume of the vrinding bobbins.
Plastics such as polyurethane, polypropylene, polystyrene, aczylonitrile-butadiene-styrene (ABSj may be used as bobbin material. In case a higher strength is z~equired, the plastic may be reinforced by suitable materials, such as glass fibres_ Th2 connection between bobbin core and the detachable flange should preferably have positive fit, i.e. preferably by snap-in elements, arranged at the winding core and at the bobbin flar_ge, being engaged during assembly.
In a preferred embodiment of the winding bobbin, the second flange at the end with the larger winding core diameter cannot be detached. The second flange and the winding core are preferably designed as one piece and they may be manufactured together, e.g, by infection moulding.
~'o facilitate the stacking of full bobbins, juts and recesses have preferably been provided on the outer sides of bath flanges, i.e. on the side opposing the winding core, engagir_g with each other when stacking the full bobbins. This again simplifies the transport of full bobbins.
It is pointed out that the use of these bobbins in connection with the process as proposed by this invention is of special ad~,~ar~tage; however, the bobbins may also be used with other winding procedures and other winding devices.
Further advantages, features and applications of the present ir_vention result from the subsequent description of embodiment examples, illustrated by the relevant drawing.
Fig. 1 shows a side view of an embodiment example of the winding device as provided for by this invention, half of the winding bobbin used is shown as longitudinal section;
Fig_ 2 shows a longitudinal sect~.on through a first embodiment example of a winding bobbin, as provided for by this invention in the asssembled state;

OE/OB ' 95 10: 37 '~+49 89 5439040 C~ 008 WO 94/x.3569 PCT/Ep9~/02804 Fig. 3 shows several winding cares of the embodiment example according to Fig. 2 in stacked condition;
Fig. 4 shows several detachable flanges of the embodiment example according to fig. 2 in staclred Condition;
fig. 5 shows several full bobbins c~f the embodiment example according to Fig. 2 in stacked condition;
Fig. 6 shows the full winding bobbin according to Fig. 2 with a, pulling-off device;
Fig. 7 shows ari auxa_liary equipment fox d~.sassemblina the detachable glange in the embodiment example according t0 Fig. 2;
Fi.g. 8 shows a sectional view of a second embodiment example of a winding bobbin as provided for by this invention, along the line II-II in Fig. 10;
Fig. 9 shows an enlarged partial w=ew of the winding bobbin according to Fig. 8;
Fig. 10 shows a subvic~w of the small flange of the winding bobbin according to Fig. 8, here subview means as seen from the side opposing the winding core of the flange;
Fig. 11 shows a partial view of the smaller flange according to Fig. i0, as seen from the upper side, the windir:g core not being shown;
fig. 12 shows a sectional view through the winding core along line I-1 in Fig, 8, the lower flange being not shown;
Fig. 13 shows a view, simiJ.ar to that in fig. 3, with a number of detachable flanges of the winding bobbin according to fig. 8, in stacked condition;
Fig. 14 shows a view, similar. to that in Fig. 4, showing how full winding bobbins of the embodiment e:cample according to Fig. 8 are stacked upon each other;

_ 2.~509~8 02iU8 '95 10:J7 1~+49 89 8459040 f~009 Fig_ 15 shows the assembly of the detachable flange. in case of a winding bobbin of the embodiment example according to Fig. 8; and Fig. 16 shows the disassembly of the detachable flange in case of a winding bobbin of the erni~odiment example according to Fig. 8.
An embodiment example of the winding device according to the present invention will be described subsequently with regard to Fig. 1.
The device, in general referred to with 100. includes a first bobbin holding member 1.03 and a second bobbin holding member 104. The winding bobbin 50, still tv be detailed with reference to Fig. 8, includes a con~.cal winding care 52 and a first flange 53, as well, as a second flange 54. 'rhe first flange 53 is arranged at the end of the winding cure having a ~malle-r diameter, the second flange 54 at the end of the winding core having a larger diameter. The winding' bobbin is basically rotationally symn;etrical. to the axis 56 in longitudinal direCtion_ As shown, the winding dev:.ce is to be designed preferably such, that the bobbin's longitudinal axis 56 is vertical and the first flange 53 is on the bottom and the second flange is on.
tcp.
The bobbin holding member 103 is a7.so basically rotationally symmetrical and rotatable around axis 106. The bobbin holding member includes a ground plate 108, where a supporting plate 109 with smaller diameter is axranged_ On the suppo~'ting plate 109 there is a cone 11,1, engaging with an accordingly fc~rmEd bore 72 of flange 53 of the winding bobbin 50. This cone centers the winding bobbin with xegard to the bobbin holding member 103.
Concentri.cal to bobbin holding member 103 a belt pulley 115 is arranged, driven by driving equipment 116 (riot detailed) via driving belt 117.

02/08 '95 1D:38 '8+49 &9 5439040 Wo 94/13569 ECT/Ef92/02804 Tt~e upper. bobbin holding member 1074 includes a plate 120, fixad on a plunger 122. The plate mal~ be rotated around rotation a:cis 123, coinciding with axis 56 of the winding bobbin and axis 106 of the lower bobbin holding member. As shown by arrow 125, trie plunger may bE lifted and lowered by piston cylinder units 12~
and 128 (root detai.led). The pistons 129, 1.30 of the piston cylinder units are connected to plunger 127 by yoke 131.
On plate i20 a ring 113 is fixed, showing in the direction of the winding bobbin, its outer wall is inclined towards plate 12Q, the angle corresponding to the coning angle of the winding '' bobbin 50. A second ring 113 zs joined an to the outer circumfer8nce of plate 120, also pointing to the bottom, to the winding bobbin.
2n addition the windzng device :includes a traversing unit 140, provided with a laying roller 142, leading tlae wire and/or the cab~.e D to the winding bobbin. As shown by double arrow 143, the laying roller 142 may be lifted and locaered it the direction parallel to the wiuding~ bobbin axis 56. In addition t2;e troversing unit ~.ncludeb a threaded spindle 144, e~ctendir_g parallel to the longitudinal axis of the winding bobbin, rotatable in bath directions via drive unit 145. Depending on the direction of rotation of the traversing unit, the laying roller will. be lifr,ad, i.e. moved in the direction of the drive t!nia_ 145, and lowered again.
r vI
The funccior! of the winding device is controlled by a control an'_t (noc shown). The control unit receives sensor signals, indicating the angular speed df the bobbin and signals indicating the relevant, position of the laying roller i~2.
Cn the basis of these signals drive unit 116 and drive unit 145 wil3. be controlled such that the desired yrin3i.ng type will be tortned on bobbin 50 during the winding process.
In the following paragraphs the Euz~Gtion of this device will be described:

2t ~ 0958 : 011 02/08 ' 95 10: 98 'b'+49 89 5.159040 The plunger 12~ and thus the bobbin holding member 204 will be lifted by a lifting movemexlt of th.e piston ~:ylinder units 127 and 128. A winding bobbin will either mansally or by an automatic device be put onto the bobbin holding member 103, thus cone 111 Of the bonbin holding member will engage ir_Lo opening 72 of the winding bobbin, thus centering it.
Subsequently plunger 122 with the bobbin holding member 1G4 will be lowered, until it meets the upper bobbin end. The conical ring 212 thus cenr_exs the upper end of the winding corn Y:aving the larger diameter and ring 113 of the bobbin holding member supports flange 54 of the bobbin.
Tre wire end is then fixed on the lower flangr_ 53, e.g. by an automatic decrxce and the winding bobbin is then rotated to ,wind up the wire or cable. pri~re unit 11~ and 245 are preferably controlled in such a way that a winding type is formed, comparable to that in EP-B-0 334 211, in particular as shown in gig. i, 2 and g and in the relevant description.
During the winding process the lower flange 53 is supported by supporting plate 109 and the upper flange 54 by p~.atr~ 12Q cf bobbin holding member 104 and/or by ring 113. In this way th.e flanges cannot deform due to the winding pressure or tY~E weight of the winding material. This permits not only the absorption _ of the axial forces, but also of the radial forces, acting i_n J. the winding bobbin. In the lower bobbin holding member 103 this is done by cone 1W , supporting large surfaces of the lower flange 53. As the flange may be equipped with suitably reinforcing ribs, as can be taken from the description, this support is able to prevent an unacceptable deformation of the flange, despite its low wei.gYat.
The upper end of the winding core and flange 54 will be held as if by tongs by ring 112 and ring 113, supported by an adequate hut of flange 54. Plate 120 directly absorbs the radial forces acting to the inside and to the outside, thus reliably prever_ting a defozmation of the winding core arid flange ir: this field.

_ 2150~~8 02/08 '95 10:x9 $'+49 89 5499040 ~ 012 WO 94/13569 PCT/EP92J0280~

As soon as the bobbin is full, the wire is catched and cut, preferably by an automatic catching and cutting device, and the and at the bobbin is fixed on the bobbin, preferably by an automatic device. Subsequently the bobbin will be taken out and it may be stacked or transported without any further packaging.
A f~.rst embodiment example of the winding bobbin, as it may be used in the device as provided for by this invention, .s described with regard to Fig. 2 to 7.
The bobbin 1 as shown in Fig. 2 consists of a conical winding core 2, a first flange 3 and a second flange 4. The first flange 3 may be detached «nd arranged at the end 2a of the winding core, having a smaller diameter.
The second flange 4 is arranged at end 2b of the winding core having a larger diameter, forming one piece with the winding core.
Basically the bobbin is rotationally symmetrica~I. to axis 6 in its longitudinal direction.
At the end 2a of winding core 2 with tYse smaller diav~eter, a number of indentations a is provided in the winding care, having always the same distance to one another. By these indentat~.ons a variety of bans 9 is formed, which may be pressed to the outside against an elastic restoring force, i.e.
away from the rotational axis 6.
Bach bar 9 includes in its edge area, forming the end edge of the winding core with the smaller diameter, a snap-in pin 10 (see also Fig. 7), being basically vextica7. to the rotational axis 6 of the winding core.
on the second flange end, the fixed flange 4, reinforcing r~.bs z4 are provided, increasing the flange strength. rn addition several bores 16 are arranged in the flange, being vert.i.cal to the rotational axis 6. The bores may be used for hoist~.ng equipment, but also far fixing winding-orf auxiliary equipment (see a? so Fig. 4) .

~1~09~8 02/06 '95 10:J9 $+~9 89 54J9040 ' f~OlJ
WO 94/13569 PCT/$P92/02$04 As can be seen in Fig. 2, the coning angle 18 of the cylinder outer jacket 2c correspor_ds tv the coning angle 19 of the cylinder inner jacket 2d or, in other words, the jacket of the winding core has a constant wall thickness between the two flanges.
As the end with the larger diameter 2b of the winding core is open, a cynical hollow space 2e is formed, pernlitting the stacking of the winding core.
As may ba seen in Fig_ 2 and 7, the first, detachable flange 3 '- includes a conical shoulder 20, rotationally symmetrical to axis 21, in assembled condition coinciding with rotational axis 6 of the winding coxe_ The conical shoulder 20 includes snap-in juts 23, whose snap-in surfaces axe basically vextical to the cylinder axzs 21; for assembly this conical shoulder 20 is directed towards winding core 2.
The conical shoulder 20 is formed in one piece with the rytationally symmetrical flange plate 26. On the side opposing the winding core 2 there are three concentric ribs, forming an inner rib ring 28a, a middle rib ring 28b and an outer rib ring 28c.
W the middle rib ring 28 the indentations 2a are provided.
The function of this bobbin is as follows:
winding core 2 and flange 3 will be manufactured separately, preferably by injection moulding with a suitable plastic material.
For bobbin assembly flange 3 will be put on a level surface and end 2a of the winding yore will be pressed anto the con-cal shoulder 20. As the upper surface 20a of the conical sroulder i3 slightly conical, tha bars 9 with the snap-in pins 1U are pressed to the outside, if pressure is e~terted to th= wirding~
core iri vertical direction r_o flange ~. ~s soon as the winding core 2 has been pushed far enough to the bottom, bars 9 with snap-in pins 10 spring back elastically and the snap-in pins i0 sit close to the snap-in surfaces 24. The assembly is finished and the wir_dzng may be started.

02/08 '85 10:40 ~'+49 89 5459040 _ ~1~OJ~8 X014 WO 94/13569 PCT/Ep9Z/02804 As soon as the first wire windings have been laid around the bobbin core (see Fig. 5), the snap-i.n pins 10 and the bars 9 will be hindered to move to the outside. 'thus a firm positive conr~ection between winding core 2 and the detachable flange 3 is achieved. As a consequence the strength cf the connection is far higher than it corresponds to the elastic holding foxces of bars 9. 'This means that the thickness of the winding core jacket and the geometrical arrangement of the snap-i.n pins may be chosen such that a manual assembly and disassembly is possible.
Additional securing means, such as a screw locking or the like, are not required.
Fig. 3 and 4 show the transport advantages of the wixiding bobbin. as provided for by this invention. Far trztnsport winding core ~ and detachable flange 3 will ba separated and the :vinding cores will be positioned in such a way that end 2b of the winding core having the larger diameter points to the bottom, e.g. on to a transport pallet. Then a large r_umber of adequGte winding cures may be stacked on tl~~e winding core, the winding cores always toucrxing each other with the uppar end of flange 5~. Thus a small air gap is formed between the winding cores stacked into each other, minimizing the adhes.ional foz~ces between the stacked winding cores, permitting an easy separation of the winding cores.
Fig. 4 shows how tha detachable flanges 3 may be stacked.
As can be seen in Fig. 4, the inner rib ring 282 is designed such that it fits exacCly into the conical opening 20b of the conical shoulder 20 of the flange. Thus the flanges may not only be stacked in a space-Saving way, but a slipping of the flanges with r-egard to each other is prevented.
The following example shall explain the trwnsport advantages of the bobs~in design as provided for by this inventior__ In order to transporr_ about :.00 not decomposable bobbins of nnzmtal dimensions with a diameter of 400 mm, 17 pallets are recpai.red, as only 6 bobbins can be placed on one pallet. ~'he overall loading area reqW red amounts to 16,32 m', cvrrespanding to a loading volume of 9,95 m3 at a loading haight of 610 mm.

02/08 '95 10:40 $+49 89 5x39040 ~ 015 P10 94/13569 PCT/EP92/42$04 If, however, 100 disassembled bobbins as provided for by this invention, are transported, four stacks with 25 winding cores and two stacks with 50 detachable flanges each may be arranged on one pallet. As a consequence the overall loading aroa corresponds to the area of a pallet of 0,96 mZ, corresponding to a loading volume of 1,224 m at a loading height of 1275 mm_ The use of the bobbins as provided for by this invention results in a reduction of the loading area to 1/17 and a reduction of the loading volume to 1/8. zn addition the loading and unloading i.s essentially simplified, as only one singular pallet has to be moved fox loading these 200 bobbins.
However the design as provided for by this invention is also of advantage if full bobbins have to be transported.
As shown in Fig. 5, full bobbins may be stacked directly one upon the othe~_-. In this case the outer reinforcing ring 28~ and the middle reinforcing ring 28b of the first detachable flange 3 axe directly supported by the second fixed flange of the bobbin. In this case flange ~ engages into the indentaticns 29 in such a way that the winding bobbins are centered with respect to each other and furthermoze a slipping of the bobbins with respect to one another is not possible. Due to the design as provided for by this invention, only half-full bobbins may be transported and stored too_ Fig. 6 shows how the bobbin may be used directly as winding-off device.
To this end the bobbin is placed vertically, as preferred in moat cases during winding-on and winding-off, such that ,-he detachabla flange 3 is situated on level ground. A metal winding-off ring 35, having a vaulted metallic surface 36, is put on to the upper flange ~ or put on and/or inserted partly into tha conical hollow space of winding core 2 and secured with bolt 37 in the bores 16.
As may be seen in Fig. 6, wire 38, wound on bobbin 1, is 12d over this winding-off ring ~5 and through an eye 39. In this way the wire may be pulled off the bobbin wi~hout further auxiliary equipment.

02:08 '95 10:41 $'+49 88 5439090 _ 2~.~(~~9~~
P1o 94/13569 PCT/Ep92/02804 It is also possible to pull off the wire directly from the bobbin without additional equipment, i.e. without tair_ding-off ring.
Fig. ? shows how winding core 2 and detachable flange 3 may be separated from each other.
To this end a plunger 42 i.s used as auxiliary device, consisting of a longer cylino.rical rod 43 with a handle 44, a cylinder 45 being fixed at its lower end. The outer diameter of '~ tr~is cylindEr is slightly larger than the internal diameter of the winding ec~re in end area 2a.
For separating the two bobbin parts the auxiliary device 42 is inserted. As soon as cylinder 45 reaches the lower end area 2a, the bars 9 with the snap-in pins 10 will be bent to the outside and separated from the snap--in suxfaces 24. Then the winding core will be lifted off from flange 3 without ~rly further measures.
On the one hand the boi~bin design as provided far by this invention has a high strength, on the other hard i.t may be transported in a simple and cost-effective way. Only a few seconds are required for assembling and/or disassembling the bobbin.
Due to the bobbin's stability the windings are held so steadil~~
on the bobbin, in particular in case of the double-conical winding type, that spec~.al measures, such as fastening or hooping of the package is not rer~uired.
second embodiment example of the winding 3~c~bbzn is now described with reference to Fig. ~ to 16.
she winding bobbin referred to as 50 has a conical winding core 52 and a first flange 53, detachably coranected to wincing core 5=, arranged at the winding core end having a smal.7_ex' dyameter. A sECOnd flange 54 is arranged at the winding core end with larger diameter and these form arse part. The bobbin in general is basically :rotationally symmetrical to the longitudinal axis 56.

02: 08 ' 95 10 ::11 $+48 89 5459040 ~oi~

~6 The winding core 52 with flange 54 joined on and the detachable flange 53 are made of plastic.
s i~lange 54 consists of a basically annular wall part 55, extending on a level sursace, being vertical to rotational axis 56 of the bobbin. Wall part 5~ is reinforced by reinforcing ribs 57 arranged vertically to it.
In addition wall part 55 is connected to a cylindrical annulus 58, whose diameter is larger than the upper end diameter of the winding core. Ring 58 is designed as one piece a.nd has a variety of xeinforcix~g ribs 58a.
rn addition the upper flange 54 is provided with a variety of bores 59, used nor fixing hoisting tools or for fixing a winding-off ring.
At the outer circumference of the flange an upwardly directly bevelling 60 is prcvided, xounded in itself. zt is thus possible to use the upper flange 54 without winding-ofz ring directly as winding-off device.
Adjacent to this bevelling 60 there is a second cylindrical ring 61, giving additional stiffness to flange 54 and connected wieh reinforcing ribs 57.
As can be seen in Fig. 12, many snap-in juts 64 protruding to the inside are added to the winding core end having a smallex diameter, tl-.us increasing the strength of the snap-ir_ juts 64 by radial links 65 (see also Fig. 9) connected With tr:e internal area of the winding core_ '"he snap-in juts 64 - there are eight juts in the embodiment example - are arranged at equal distances around tire internal circumgerence of the winding core and dimensioned ~.n such a vray that the distance in circumferential direction, i.e. the cleax width between two adjacent snap--in juts, ie slightly larger than tre length of the snap-in juts itself. ' In the embodiment example the juts for a typical dimension in a smallest winding core d:~ameter of 1?e mm are approxirr.ately dimensioned such that they extend 5 to 12 mm from the lowEr inner edge of the winding core to the inside.

0206 '95 10:2 $+a8 89 5439040 ~l 018 WO 94/13569 PCT/E~92/02804 i~
In the assembled cond~.tion the first detachable Flange 53 includes an annular plate 66 facing the winding material, having an outer annular reinforcement 57, opposing the winding material, designed in form of two conr_entric zings, a second middle reinforcement 68 in annular form as well as a third inner annular reinforcement 69. A centering ring 70 is provided concentric to the axis of rotation of the flange (corresponding to the axis of rotation of the bobbin in assembled condition), adjacent to the inner reinforcing ring 69, having a conical recess 72.
F large number of equidistantly arranged reinforcing ribs ~4 is arranged on the flange side opposing the winding material for further flange reinforcarnent. In the outer fJ,ange area, between the outer reinforcing ring 57 and the middle reinforcing ring 68, the number of ribs is double as high as between the middle reinforcing ring 68 and the inner reinforcing ring 69, in order to effECt a higher stiffness of the flange in tr~is area..
The diameter of the reinforcing ring 6$ is slightly larger than the diameter of the reinforcing ring 58 of the second flange 54. Furthermore the reinforcing ribs 74 in the reinforcing ring 68 have indentations '74a (see Fig. 8). In case the full bobbins are stacked one upon the other, as shown in Fig. s.~, the reinforcing ring SS of the second flange engages into the recesses 74a, the upper part of the reinforcing ring S8 resting on reinforcing ring 68. When stacked., the upper bobbin will thus be centered exactly with regard to the lower bobbin and slipping of the upper bobbin with regard to the lr~wer boabin is prevented.
an the side facing the winding material in assembled Condition, flange 53 has an essentially annular recess 75, in which a holding structure 76 is arranged, acting together witl-. the snap-in juts 64 of the winding core.
The holding structure 76 includes a cylindrical ring 78 arrangEd concentric to the axis of rotation, from where a number of holding juts '79 protrudes radially to the outside_ On each holding jut a reinforcing rib es is arranged, extending irl radial direction, forming an additional connection between the holding juts and the cylinder ring 78, thus stiffening the holding juts in axial direction of the winding bobbin.

02i0B '95 10::12 '~+49 89 5439040 _ 2 ~ ~ 0 9 5 8 f~019 wo 94/135ss PCT~EP92/0280~4 1. 8 As indicated by double arrow 83, a clearance in circurnferential direction is provided between holding jars 79, being slightly larger than the dimension of the snap-i.n juts 64 of the winding core_ As can be seen in Fig. 9, the annular recess 75 zs formed by a first wall section 84, whose front wall suface, facing the winding core, is inclined towards the axis of rotation in the same angle as the wall, of winding core 52_ A second wall section 85 exr_ends next to this first wall section 84, arranged vertical to the axis of rotation.
The connection between winding core and flange ie formed by putting tl:e winding core cn the flange in such a way (sme Glso Fig. 15) that the snap-i.n juts 6~ axe situated in the spacing 83 of the flange. In r_his way the winding core rnay be inserted into the flange such that the lower end of the trinding crre wit: the snap-in juts 64 touches the seccnd wall section 85, as shown in Fia. 9. Subsequently the winding core and flange are twisted with respect to each other, until the links 65 of the snap-in juts 64 sit close to the links n2 of the holding jute 79. In this position always one snap-in jut 64 engages w~.tr_ an allocated holding jut 79, such that an axially secured connaction between winding core and flance is formed.
In order to secure the connection radially, at least one locking element is provided, its design is described wi;:h regard to Fi.g. 9, 10 and 11.
The locking element 86 consists of an elastic material such as plastic or metal and includes a l~ongitudxnal plate 87, held by two 7~ateral links 88 and 89 in the flange. In addition a racess 90 is provided in the middle reinforcing ring 68, holding plate 87, and the reixlforcing ring 67 is provided with a rib 97., protruding radially to the inside, forming a bag, holding the end 8~a of the plate oL the lock~.ng element 86, opposing the winding core. In this position plate 87 is basically para7.lel to the surface of flaxige 53 facing the winding matexial and it is held in this position.
At the end 87b of the plate, facing the winding core, a bracket 92 is joined on, forming one piece with the plate; its ~r~idth is slightlx smaller than the width of an interspace 83 between the two holding juts 79 of the flange.

-, 0208 ' 95 10 : 43 '8;-49 89 5459040 7. 9 On the side of plate 87 opposing bracket 92, a wedge-shaped enlargement is joined an, forming a wedge gap 94.
The front end 87b of the plate has only a minor distance t~ the inner reinforcing ring &9 of flange S3, such that the lQCking element 86 is held captively at the flange by rib 91, recess 90 and rib 69.
The function of this lQCking element will be described Iaelow.
Wren inserting the winding core into the annular recess 75 of the flange, t:.e locking element (as shown in Fig_ g) will be elastically deformed and pressed down. As soon as the lower end of the winding core reaches the second wall section 85, the winding core will be turned, thG snap-in juts 64 thus being positioned below juts 79. In this position the ~nterspace between the two adjacent holding juts, where the locking elemer_t i_s arranged, gets free and the loc)cing element ac3a ~ n mQVes up due to the elastic restoring force. thus the interspace between these holding juts W 11 be closed and a relative motion of the winding core and the flange in ~:adial direction towards each other is prevented. Thus the flange is secured in th~.s condition axially as well as radially with regard to the winding core.
The we3ge-shaped indentation 93 has a double function.
As can be seen in Fig. 1, the loner flange 53 of the winding bobbin 50 will be supported by supporting plate 109 when received in the winding device. As the lower end of the we3ge-shaped enlargement (see ~'ig. 9t is exactly identical to the lower ends of the reinforcing ribs 67, 68 and 69, this wedge-shape3 enlargement will alsG be supported by supporting plate 109. Thus a movement of the locking element in axial direction towards the winding core ~.s prevented, such that a deformation of the locking element and thus a release of the radial locking is excluded.
A~ shown in Fig. 16, a suitable tool, e.g. a screw driver, may be inserted into the wedge-shaped gap 94 for disassembling tha winding core_ The wedge-shaped gap 94 and thus the front end 87b of platy 87 will thus be pressed down (as can be seen in Fig. 9), the link 92 thus clearing the interspace between the adjacent holding juts; flange and. winding cone may be ~J020 _ ~~~oo~s 02.08 '95 10:93 '~+49 89 5439040 f~1021 i9G 94/13569 PC~/EP92/02844 txisted with respect to ona another. The winding- core may then be taken off from the flange without any further manual actl.~Jity.
lifter separating the detachable flange 53 from winding core 52, the winding cores may be stacked in a similar space-saving way, as shown in Fig. 3.
As depicted in Fig. 13, even the detachable flanges 53 of bobbin 50 may be correspondingly stacked one upon the other in a space-saving way (see Fig.
When stacking the flanges upon each other (see Fig. 9 and Fig.
13~, ring 78 engages in interspace 71 between ring 69 and zing 70 of flange 53. To this end ring 69 has a number of notches, indicated in Fig. 9 and 10, into which. the links 81 engage when stacked.
By the interaction of ring 78, ring 69 and ring 70, the flanges will be secured radially to each otr~er, such that they cannot move with respect to each other in stacked condition. m addition, the fixed links 81 and the allocated notches result in a twist locking of the flanges in stacked condition.
As can be seen, the present invention proposes a process and a device, able to create a package, consisting of a winr3ing bobbin with wire or cable wound on it, offering special transport and processing advantages. As the package is of high strength, in particular when using a double-conical winding type, it may be transported without turt,her packaging material.
Therefore the user of this package has nr~ waste to dispose of_ Due to the comfortable stacking ability of the divisible plastic bobbin proposed in this invention, the plastic bobbin may be stored at the user in a space-saving way and also transported back to the wire or cable manufacturer_ in a ~pace-saving wdy.

Claims

CLAIMS:

1. Process for manufacturing a package with elongated winding material which can be transported without packaging, including the following procedure steps in chronological sequence:
composing a winding bobbin having a conical winding core and a first and a second flange at each end thereof, at least the first flange at the smaller diameter end of the winding core being detachably connected to the winding core;
securing the first flange to the winding core in such manner that it does not inadvertently loosen from the winding core during winding and transport, inserting the winding bobbin into a winding device, wherein said winding bobbin is received by two bobbin holding members, centering the two flanges and supporting them against winding pressure in the winding device;
winding the winding material on the winding bobbin by means of a traversing unit that is controlled by a control unit, such that a predetermined winding type is formed on the bobbin;
terminating winding and removing the winding bobbin from the winding device when the bobbin is as full as desired, and severing the winding material to create a cut end and fixing the cut end of the winding material to the winding bobbin.

2. Process according to claim 1, characterized in that at least one said bobbin holding member is connected to a drive unit for driving the winding bobbin to wind the winding material thereon.

3. Process according to claim 1, characterized in that the traversing unit is connected to a drive unit that moves the traversing unit around the bobbin for winding the elongated material thereon.

4. Process according to claim 1, characterized by the following procedure steps:
after insertion of the bobbin, positioning the traversing unit at the small end of the winding core;
winding on said core a first winding layer with a predetermined winding number and a predetermined winding pitch;
returning the traversing unit into a start position at said small end of the winding core, forming a second winding layer with a winding number and a winding pitch that are the same as in said first winding layer;
applying further winding layers with an ever increasing number of windings, the relevant number of winding layers being chosen such that a winding type will be formed on the bobbin in which at least part of the winding layers are inclined towards the winding core as seen longitudinally of the bobbin, continuing to apply such winding layers with increasing winding number until a first full-length winding layer reaching the large diameter end of the winding core is applied, continuing the winding process by applying further full-length winding layers, with a winding number equal to no more than the winding number of the first full-length winding layer.

5. Process according to claim 4, characterized in that the increase in winding number of the successive winding layers is such that after applying a number of winding layers and prior to reaching the winding number of the full-length winding layer the distance of at least some of these individual winding layers to the axis of rotation of the winding bobbin at the first flange reaches its maximum.

6. Process according to any one of claims 1, 4 and 5, characterized in that in the winding device one bobbin holding member interacts with locking means preventing loosening of the first flange such that said locking means is blocked in its locking position.

7. Process according to either one of claims 2 and 3, characterized by the following procedure steps:
after insertion of the bobbin, positioning the traversing unit at the small end of the winding core;
winding on said core a first winding layer with a predetermined winding number and a predetermined winding pitch;
returning the traversing unit into a start position at said small end of the winding core, forming a second winding layer with a winding number and a winding pitch that are the same as in said first winding layer;
applying further winding layers with an ever increasing number of windings, the relevant number of winding layers being chosen such that a winding type will be formed on the bobbin in which at least part of the winding layers are inclined towards the winding core as seen longitudinally of the bobbin, continuing to apply such winding layers with increasing winding number until a first full-length winding layer reaching the large diameter end of the winding core is applied, continuing the winding process by applying further full-length winding layers, with a winding number equal to no more than the winding number of the first full-length winding layer.

8. Process according to claim 7, characterized in that the increase in winding number of the successive winding layers is such that after applying a number of winding layers and prior to reaching the winding number of the full-length winding layer the distance of at least some of these individual winding layers to the axis of rotation of the winding bobbin at the first flange reaches its maximum.

9. Process according to any one of claims 2, 3, 7 and 8 characterized in that in the winding device one bobbin holding member interacts with locking means preventing loosening of the first flange such that said locking means is blocked in its locking position.

10. Device for winding up elongated winding material on a winding bobbin in order to produce a package that can be transported without packaging, and in particular for performing the process according to any one of claims 2, 3, 7, 8 and 9, wherein said two bobbin holding members receive the ends of the bobbin and center them, the bobbin holding members being arranged such that the longitudinal axis of the winding bobbin received therein is basically vertical;
the traversing unit supplying the elongated winding material to the bobbin being movable parallel to the bobbin's longitudinal axis;
the drive unit being connected to one bobbin holding member or to the traversing unit in such a way that either the bobbin or the traversing unit rotate around the bobbin's longitudinal axis;
further comprising:
a lifting equipment for moving at least one of the bobbin holding members with regard to the bobbin, such that the winding bobbin can be put in or removed from the winding device; and the control unit controlling rotational motion of the drive unit and the motion of the traversing unit parallel to the bobbin axis in such a way that the predetermined winding type is formed on the bobbin;
characterized in that the bobbin holding members are designed to receive the winding bobbin;
a first, lower bobbin holding member (103) including a supporting plate (108, 109), supporting directly a first, lower flange (53) of the winding bobbin;
a cone (111) arranged on said supporting plate, engaging into a bore (72) of said lower flange (53) for centering the winding bobbin;

a second, upper bobbin holding member (104) including a basically circular plate (120), designed to support a second upper flange of the winding bobbin;
said basically circular plate (120) including a first centering unit (112) protruding towards the winding bobbin and adjacent to an inner wall of the winding core.

11. Device according to claim 10, characterized in that said centering unit (112) is designed as rib, fixed to said circular plate (120).

12. Device according to claim 11, characterized in that a second rib (113) is arranged concentrical to said centering rib (112) on the basically circular plate (120), supporting the upper flange (54) of the winding bobbin.

13. Device according to any one of claims 10 to 12, characterized in that this lifting equipment is connected to the plate (120) of the upper bobbin holding member.

14. Winding bobbin for manufacturing a package which can be transported without packaging and in particular for use in the process according to claim 1 or with the device according to claim 10, the winding bobbin being designed for holding elongated winding material and in particular winding material containing metal, such as wire, strands and plastic-coated strands, with a basically rotationally symmetrical, conical hollow winding core, having a first end with smaller diameter and a second end with larger diameter, a hollow space (2e) of the conical winding core (2) being designed conically and the coning angle (18) of an outer jacket (2c) and the coning angle (19) of an inner jacket (2d) being basically identical, the hollow space (2e) opposing the second end with larger diameter being open, the second flange, arranged at the second end of the winding core having a larger diameter, characterized in that the winding bobbin includes the first and the second flange, this first flange (3) being detachably fastened to the first end of the winding core (2a) with smaller diameter (2a) and connecting means (9, 10, 23) are being provided, connecting this first flange (3) and the winding core (2) with each other, being designed such that the first flange cannot loosen from the winding core during winding and transport, these connecting means include snap-in juts (64) at a certain distance to each other, protruding radially to the inside, interacting with adequately designed, radially extending holding juts (79) at the first flange (53), when assembled, such that the first flange and the winding core are held relatively to each other in axial direction, i.e.
in longitudinal direction, of the axis of rotation (56) of the winding bobbin (50), and at least one locking element (86) is provided, securing the connection between the first flange and the winding core radially.

15. Winding bobbin according to claim 14, characterized in that the winding core (2; 52) is made of plastic.

16. Winding bobbin according to claim 14 or 15, characterized in that the first flange (3; 53) is made of plastic.

17. Winding bobbin according to claim 14, characterized in that the holding juts are arranged at a distance to each other as seen in circumferential direction of the first flange (53), being larger than the length of these snap-in juts (64) and the holding juts (79) and snap-in juts (64) are brought in engagement with each other in such a way that the winding core with the snap-in juts is at first put between these holding juts and then the first flange and winding core are twisted against each other by a predetermined angle, such that these holding juts and these snap-in juts come into engagement.

18. Winding bobbin according to claim 17, characterized in that the least one locking element (86) engages into a space between these holding juts (79), blocking a relative motion of the winding core (52) and the first flange (53).

19. Winding bobbin according to claim 18, characterized in that this locking element (86) is designed as elastically deformable element, held in the first flange, which is elastically deformable when composing the winding core (52) and the first flange (53) or from the outside by means of a tool, such that in a deformed state it sets free the space between these holding juts, such that it permits a turning motion between the winding core and this first flange; after this deformation it returns to its original position, preventing a turning motion between winding core and the first flange.

20. Winding bobbin according to one of claims 18 and 19, characterized in that the locking element includes an enlargement (93), designed such that the locking element cannot move into a position, permitting a twist of the winding core, when the winding bobbin (50) with the first flange (53) meets a level surface or an adequately formed surface.

21. Winding bobbin according to any one of claims 14 to 20, characterized in that the first flange (3; 53) has a basically annular flange surface (26; 66) and on the side of this first flange opposing the winding core, enforcing ribs are provided extending in circumferential direction and in radial direction.

22. Winding bobbin according to any one of claims 14 to 20, characterized in that the bobbin includes the second flange (4; 54) at the end of the winding core with larger diameter, being fixed to the winding core (2).

23. The winding bobbin of claim 22 wherein said second flange is designed as one piece with the winding core (2).

24. Winding bobbin according to claim 21, characterized in that the bobbin includes the second flange (4; 54) at the end of the winding core with larger diameter, being fixed to the winding core (2).

25. The winding bobbin of claim 24 wherein said second flange is designed as one piece with the winding core (2).

26. Winding bobbin according to either one of claims 24 and 25, characterized in that enforcing ribs are provided at the second flange (4; 54) in circumferential and in radial direction.

27. Winding bobbin according to claim 26, characterized in that the enforcing ribs of the first flange (3; 53) and the second flange (4; 54) are designed such that when stacking several assembled bobbins are stacked one upon the other, the enforcing ribs of the first and second flanges engage such that a positive connection is formed, preventing a slipping of the flanges relative to each other.